docs: add CONTRIBUTING.md

Author: typicalninja

.github/CONTRIBUTING.md

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+# Contributing to google-sr
+
+Thank you for your interest in contributing! ❤️ 
+We welcome bug fixes, features, and documentation improvements.
+
+> If you like the project, consider giving it a star! ⭐
+
+## Code of Conduct
+
+This project follows the [Code of Conduct](CODE_OF_CONDUCT.md).  
+Please report violations via Discord or the issue tracker.
+
+## How Can I Contribute?
+
+### Prerequisites
+
+Ensure you have the following installed:
+
+- [Node.js](https://nodejs.org/)
+- [pnpm](https://pnpm.io/)
+
+### Setup
+
+To get started, please follow these steps:
+
+1. Fork and clone the repository to your local machine, make sure you're on the `master` branch.
+2. Install the dependencies by running `pnpm install` in the root of the monorepo.
+3. Run `pnpm run build` to build the packages.
+4. Run `pnpm run dev` to start the development server.
+5. Make your changes.
+6. Run `pnpm run test` to run the tests.
+7. Once you're done, commit your changes (make sure to follow the [Conventional Commit format](https://www.conventionalcommits.org/en/v1.0.0/))
+8. Push & open a PR to `master` branch.
+
+### Scraping search results
+
+Always use this **user agent** when scraping:  
+`Links (2.29; Linux 6.11.0-13-generic x86_64; GNU C 13.2; text)`
+
+The `search-dump` script is provided to help you dump search results with an identical
+setup to the one used in google-sr.
+
+Run `search-dump.js` to dump search results:
+```bash
+# change directory to the search-dump script
+cd apps/scraper
+
+# run the script, all arguments are joined with a space as the search query
+node search-dump.js "search query"
+```
+
+### Reporting Bugs
+
+Before creating bug reports, please check the [existing issues](https://github.com/typicalninja/google-sr/issues) 
+to see if the issue has already been reported.
+If you find your issue already reported, please add a reaction to the issue to show that you are also facing the issue.
+
+When you are creating a bug report, please include as many details as possible.
+Please include the following information:
+* A clear and descriptive title.
+* A detailed description of the issue.
+* Steps to reproduce the issue.
+* The expected behavior.
+* The actual behavior.
+* Screenshots or videos of the issue.
+* Any other relevant information.
+
+A bug report template is available to guide you through the process.
+
+### License
+
+By contributing, you agree that your contributions will be licensed under the [MIT license](../LICENSE).